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LibAudio: Implement decoding verbatim blocks in FLAC

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They're mostly used in literal random data, so it isn't like
there is a high demand for it, but it's cool to have more complete
implementation anyway. :^)
This commit is contained in:
Karol Kosek 2021-08-03 18:01:22 +02:00 • committed by Andreas Kling
parent a086be993b
commit 1c65ee6edf
1 changed files with 10 additions and 3 deletions
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13
Userland/Libraries/LibAudio/FlacLoader.cpp
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@ -621,10 +621,17 @@ Vector<i32> FlacLoaderPlugin::parse_subframe(FlacSubframeHeader& subframe_header
return resampler.resample(samples);
}
// Decode a subframe that isn't actually encoded
Vector<i32> FlacLoaderPlugin::decode_verbatim([[maybe_unused]] FlacSubframeHeader& subframe, [[maybe_unused]] InputBitStream& bit_input)
// Decode a subframe that isn't actually encoded, usually seen in random data
Vector<i32> FlacLoaderPlugin::decode_verbatim(FlacSubframeHeader& subframe, InputBitStream& bit_input)
{
TODO();
Vector<i32> decoded;
decoded.ensure_capacity(m_current_frame->sample_count);
for (size_t i = 0; i < m_current_frame->sample_count; ++i) {
decoded.unchecked_append(sign_extend(bit_input.read_bits_big_endian(subframe.bits_per_sample - subframe.wasted_bits_per_sample), subframe.bits_per_sample - subframe.wasted_bits_per_sample));
}
return decoded;
}
// Decode a subframe encoded with a custom linear predictor coding, i.e. the subframe provides the polynomial order and coefficients